Solana: How can a rust program get access to the `syscall_base_cost` value?

Access to Budjet Values ​​Rust

When constructing the Sorana program, one of the critical components is a calculation budget that defines the cost of the instructions. In this article, we will look at how to get certain values ​​in the calculation budget with rust.

SystemCallBASCOST

The syscall_base_cost value represents the basic costs of the Solana system invitation. This value determines how much gas is needed to make a system call. Although it is not directly available from outside the program, it can be obtained programmatically with Sorana SDK.

Here is an example of a code end that sets the default calculation with some sample values:

`rust

Use the solan_ process :: {

Account_info :: {next_account_info, Accountinfo},

EntryPoint :: ProgramRresult,

Exec_info :: {yourself, programid, entrypointry, enterpoterror},

Program_error :: Printerror,

Pubkey :: Pubkey,

};

Use STD :: Collections :: HashMap;

// Set the calculation of the calculation

Const Commute_budget: & MUS HashMap , u64> = {

Let me be budget = hashmap :: new ();

Budget.insert (next_account_info (). Pubkey, 100_000); // 100k gas performable

Budget.insert (next_account_info (). Pubkey, 50_000); // 50k gas to create an event

};

`

Calculation Budget Values ​​Access

In order to use certain values ​​in the calculation budget, you can use the HashMap GETmethod. For example:

rust

FN Main () -> Programresult {

// Get the calculated cost of making a system call

Let syscall_base_cost = budjett.get (& next_account_info (). Pubkey) ?;

Println! (“Syscall Base Cost: {}”, syscall_base_cost);

// Get the calculation costs for creating an account

Let Account_Create_cost = BUDJETTI.GET (& Next_Account_info (). Account_Pubkey) ?;

Println! (“Account creates costs: {}”, Account_create_cost);

// Get the cost of a system call minimum requirement

Let min_syscall_cost = budjett.get (& next_account_info (). Pubkey)?. Min ()?;

Println! (“Min Syscall cost: {}”, min_syscall_cost);

}

`

Example of use cases

Here is an example of how to use these values ​​to optimize the program:

• When making a system call, make sure that “syscall_Base_cost” is greater than or equal to the minimum requirements for that instruction.

• If creating an event requires more gas than in the computing budget, consider using a separate account with higher gas restrictions.

Best Practices

To ensure the use of safe and effective budget values:

• Follow your remaining calculation budget at regular intervals.

• Check syscall_base_cost before making system calls to avoid minimum minimum cost costs.

• Use separate accounts or contexts for sensitive calculations that require more gas than in the computing budget.

By following these guidelines and using the Solana SDK, you can effectively control your calculation budget in the Rust program.